Application of Hydrophobic Microcapsules in Improving Concrete's Permeability

A technology of impermeability and microcapsules, which is applied in the field of road materials, can solve the problems of reduced mechanical properties, increased concrete cost, and poor compactness, and achieves the effects of simple preparation process, improved impermeability, and improved mechanical properties

Active Publication Date: 2019-01-04
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, after adding air-entraining admixtures to concrete, its mechanical properties will be significantly reduced; measures such as reducing the water-cement ratio and selecting appropriate cement will affect the working performance of concrete and increase the cost of concrete
In addition, adding water repellent to cement concrete can improve the impermeability of concrete, but the water repellent will have poor applicability with cement, which will lead to poor performance of cement concrete to a certain extent, thus affecting the mechanical properties of concrete and impermeability
[0004] The slurry-aggregate interface of concrete has a loose structure and poor density. It is the main channel for water to penetrate into the concrete. The water-repellent agent added to the concrete is easy to adsorb on the surface of the aggregate, resulting in the gap between the cement slurry and the aggregate. Form an obvious interface, thus affecting the mechanical properties and impermeability of concrete

Method used

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  • Application of Hydrophobic Microcapsules in Improving Concrete's Permeability

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The present embodiment provides a kind of impermeable concrete, is made up of following raw material by mass percentage: hydrophobic microcapsule is 0.3%, cement is 17.7%, aggregate is 74.7% (wherein fine aggregate is 21.4%, coarse aggregate is 53.3%), water is 7.3%.

[0027] Among them, coarse aggregate: limestone gravel, the crushing value is 15.1%, and the particle size is 5mm to 31.5mm;

[0028] Fine aggregate: natural river sand with a fineness modulus of 2.51 and a particle size of less than 5mm;

[0029] Cement: P·C32.5 cement, the stability is qualified, and the strength grade meets the requirements of GB175-2007 "General Portland Cement Standard".

[0030] Based on the raw material formula of this embodiment, the specific preparation process of the anti-permeability concrete of this embodiment is as follows:

[0031] Step 1, weigh 2g of gelatin and dissolve it in 200ml of deionized water, heat and stir until it is completely dissolved, and obtain an aqueous p...

Embodiment 2

[0044] The present embodiment provides a kind of impervious concrete, is made up of following raw material by mass percentage: hydrophobic microcapsule is 0.1%, cement is 17.7%, aggregate is 74.9% (wherein fine aggregate is 21.6%, coarse aggregate is 53.3%), water is 7.3%.

[0045]The requirements for raw materials and the preparation method of the impermeable concrete in this example are the same as those in Example 1. The difference is that the hydrophobic material uses sodium methyl silicate.

[0046] The test method of the cement concrete specimen of this embodiment is the same as that of Example 1, and the test results are shown in Table 1-3.

Embodiment 3

[0048] The present embodiment provides a kind of impervious concrete, is made up of following raw material by mass percentage: hydrophobic microcapsule is 0.2%, cement is 17.8%, aggregate is 74.8% (wherein fine aggregate is 21.5%, coarse aggregate is 53.3%), water is 7.2%.

[0049] The requirements for raw materials and the preparation method of the impermeable concrete in this example are the same as in Example 1, the difference is that the capsule wall is made of vinyl polysilsesquioxane and polystyrene composite material, and the hydrophobic material is made of tetraethylene Oxysilane.

[0050] The test method of the cement concrete specimen of this embodiment is the same as that of Example 1, and the test results are shown in Table 1-3.

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Abstract

The invention provides impermeable concrete and application of hydrophobic microcapsule in concrete. Raw materials for preparation of the impermeable concrete contain aggregate, cement and hydrophobic microcapsule. The impermeable concrete is composed of the following raw materials (by weight): 0.1-0.5% of hydrophobic microcapsule, 17.6-17.8% of cement, 74.5-74.9% of aggregate and 7.2-7.4% of water. The capsule core of the hydrophobic microcapsule adopts a hydrophobic material, and the capsule wall adopts a composite material of cage-type polysilsesquioxane with a function group and a polymethyl methacrylate polymer or polystyrene. As the hydrophobic microcapsule is arranged in the impermeable concrete, under alkaline condition of concrete, the wall material of the hydrophobic microcapsule is gradually getting thinner until slowly broken and slowly releasing the hydrophobic material inside the hydrophobic microcapsule. The hydrophobic degree can be manually controlled, impermeability of cement concrete is obviously raised, and mechanical properties of concrete are not influenced.

Description

technical field [0001] The invention belongs to the field of road materials and relates to concrete hydrophobic materials, in particular to the application of hydrophobic microcapsules in improving the permeability resistance of concrete. Background technique [0002] The water evaporation of cement concrete due to internal cement hydration or volume shrinkage leads to the increase of its pores or the increase of connected pores, which significantly reduces its impermeability. The common technical means to improve the impermeability of cement concrete is to increase the density of concrete and improve the pore structure, thereby reducing the permeation channels and improving the impermeability. The commonly used method is to mix air-entraining admixtures to generate disconnected air bubbles inside the concrete, cut off the capillary channels, and change the pore structure, thereby improving the impermeability of the concrete. In addition, reducing the water-cement ratio, se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42C04B28/04C04B103/65C04B111/27
CPCC04B28/04C04B40/0046C04B2103/0069C04B2103/65C04B2111/00293C04B2111/27C04B2201/50C04B24/42C04B24/2641C04B24/2676C04B18/12C04B14/068
Inventor 王振军赵鹏阎鑫吴佳育艾涛刘加平白敏
Owner CHANGAN UNIV
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